Safety device for air in at least one room of a building

ABSTRACT

A safety device for the air in a room has an intake air channel for supplying outside air to the room. A device for air treatment is provided. A detector for air contaminants is arranged in the intake air channel. A safety closure with a drive is arranged in the air intake channel and has an open position and a closed position for airtightly closing the intake air channel or an inlet of the device for air treatment that is arranged downstream of the safety closure. An exhaust air channel is connected to the room and the device for air treatment. When the safety closure is in the open position, a partial recirculating operation occurs. When the safety closure is in the closed position, a complete recirculating operation is present. The device for air treatment, the detector, and the drive are connected to a control device.

[0001] The invention relates to safety devices for the air in at leastone room of a building, wherein the room has at least one supply airchannel for taking in outside air and at least one device for airtreatment.

[0002] Known devices for air treatment in the form of, for example,air-conditioning devices for buildings, have the disadvantage that theydo not protect human beings from occurring air contaminants, inparticular, hazardous substances or organisms.

[0003] The invention defined in claim 1 is based on the problem ofprotecting human beings in rooms against occurring air contaminants, inparticular, hazardous substances or organisms.

[0004] This problem is solved with the features listed in claim 1.

[0005] The safety device for the air in at least one room of a building,wherein the room has at least one supply air channel for taking inoutside air and at least one device for air treatment, is characterizedin particular in that the human beings in the room are protected againstair contaminants, in particular, in the form of hazardous substances ororganisms. This is achieved in that within the supply air channel atleast one detector for air contaminants is arranged and is connected bymeans of a control device to a safety closure that airtightly closes offthe supply air channel when air contaminants occur. Advantageously, thedetector is arranged at the beginning of the supply air channel whilethe safety closure is arranged at its end. At the end of the supply airchannel, a device for air treatment is provided. Air treatment of theroom air results in that a portion of the exhaust air of the room istreated such that it can be used as intake air for the room. With suchdevices for air treatment the outside air proportion can be less than10%. In the case of a hazardous situation, a decoupling from the outsideair for an extended period of time is possible only with such a device.A special advantage results in that also several rooms can be decoupledfrom the outside air when air contaminants occur. With the device ordevices for air treatment, this state can also be maintained over anextended period of time. In this period of time, further measures can becarried out for hazard control. The special advantage of the safetydevice according to the invention resides in that automatically the roomis sealed off and in that the exhaust air of the room or of the rooms istreated again.

[0006] When no danger sources are present, a proportion of the outsideair is treated together with the exhaust air of the room asrecirculating air. This proportion of the required outside air can be upto a value of less than 10%. In normal operation with supply of outsideair, a proportion of the exhaust air is not treated anew asrecirculating air but reaches the environment as escape air. This escapechannel is closed off when the safety device is in operation.

[0007] The safety device according to the invention is characterizedfurthermore in that during operation there is substantially no vacuumproduced; instead, over an extended period of time, a pressurecompensation takes place.

[0008] Advantageous embodiments of the invention are disclosed in claims2 through 15.

[0009] Beneficial detectors according to the embodiment of claim 2 are asensor for at least one chemical substance, a sensor for a biologicalorganism, a dosemeter, or a device fordetermining air-borne particles.In particular, a combination of all these detectors provides an optimalprotection form air contaminants. In this connection, chemicalsubstances, biological organisms, energy-rich radiation, particlescontaminated with energy-rich radiation, or contaminant-laden air-borneparticles can be detected.

[0010] When at least one of these substances, organisms, or particles isdetected, the safety closure provided in or on the supply air channel isactuated so that the room is sealed airtightly. Of course, additionalsensors or devices for determining health-hazardous substances ororganisms can be provided also as a detector for air contaminants.

[0011] By means of a known luminescence dosemeter according to theembodiment of claim 3, the radiation acting on the luminescencedosemeter can be optically determined. A special advantage resides inthat for such a luminescence dosemeter the received radiation iscontinuously added wherein, upon reading of the received radiation, theequivalent luminescence is not lost. The luminescence is not quenchedduring reading. When several luminescence dosemeters are used, acontinuous control can be ensured. During reading of a firstluminescence dosemeter, the second luminescence dosemeter also recordsthe radiation during reading of the first luminescence dosemeter.

[0012] The first airflow sensor in the supply air channel according tothe embodiment of claim 4 is used for measuring the airflow in thesupply air channel. Based on this, it can be determined whether:

[0013] the safety closure in the reaction time in the form of theswitching times as delay times and the inertia of the safety closure hasbeen closed and/or

[0014] the safety as a function of the airflow is ensured or measuresfor lowering airflow are required.

[0015] Positioning of the detector for air contaminants in the end areaof the intake opening of the supply air channel according to theembodiment of claim 5 advantageously results in that across the lengthof the supply air channel the switching times as delay times and theinertia of the safety closure up to the point of airtight sealing can bebridged such that the air contaminants up to an airtight closure willnot escape from the supply air channel and therefore surely cannot reachthe room. According to the embodiment of claim 6, the volume of thesupply air channel is configured according to the airflow velocity inthe supply air channel and/or as a function of the time delays of thedetectors for air contaminants, the control device, and the driveincluding the inertia of the safety closure.

[0016] The embodiment of claim 7 advantageously provides air treatmentof the room by ionization. Ionization is based on electrical dischargein ionization tubes or on corona discharges. The level of the ionizationpower is determined based on values of oxidizable air components (forexample, vaporous organic compounds—VOC), the relative humidity, and theflow velocity/volume flow of the air to be treated and detected by afirst air quality sensor, an airflow sensor, and an air humidity sensorand/or a second air quality sensor, while ensuring a minimum intensityof positive and negative oxygen ions (adequate to the air state innature). The device for air treatment is controlled such thatparticularly the load of the outside air with volatile hydrocarbons ismeasured with a first air quality sensor, the flow velocity or thevolume flow of the air to be treated with an air flow sensor, therelative humidity of the air to be treated with an air humidity sensor,and the oxidizable air components of the exhaust air and/orrecirculating air by means of a second air quality sensor in therecirculating air channel between the room and the air treatment deviceand, based on the values of the measurements, the level of theionization power of at least one or several ionization apparatus iscontrolled such that a minimum intensity of oxygen ions is ensured.

[0017] In this way, the proportion of outside air can be significantlyreduced.

[0018] The embodiment of claim 8, in supplementing the embodiment ofclaim 7, leads advantageously to an air treatment of the room byionization by taking into consideration the ozone contents. Theionization is based on electrical discharge in ionization tubes orcorona discharges. The level of ionization power is determined based onvalues of oxidizable air components (for example, vaporous organiccompounds—VOC), the relative humidity, and the flow velocity/volume flowand the ozone load of the air to be treated detected by a first airquality sensor, an airflow sensor, an air humidity sensor, an ozonesensor, and/or a second air quality sensor, while ensuring a minimumintensity of positive and negative oxygen ions (adequate to the airstate in nature). The device for air treatment is controlled such thatin particular the load of the outside air with volatile hydrocarbons ismeasured by means of a first air quality sensor, the flow velocity orthe volume flow of the air to be treated by means of an airflow sensor,the relative air humidity in the air to be treated by means of an airhumidity sensor, the contents of ozone in the intake air by means of anozone sensor, and the oxidizable air components of the exhaust airand/or of the recirculating air by means of a second air quality sensorwithin the recirculating air channel between the room and theairtreatment device, and, based on the values of the measurements, thelevel of ionization power of at least one or several ionizationapparatus is controlled such that the minimum intensity of the oxygenions, when an ozone value that is too high occurs, the ozone is reducedby forming free radicals as well as naturally occurring oxygen clusters.

[0019] The special advantage resides in that in particular the value ofthe ozone in the intake air is also evaluated and controlledaccordingly, and, when reaching/surpassing preset points, signals aresent to the control device. In this way, the ionization apparatus iscontrolled such that a damaging effect on persons within the room issubstantially avoided. This is based on the ozone sensor in the supplyair channel of the room that is connected by means of the control deviceto the ionization apparatus. For an actual stable intake air ionizationthat is adequate to nature, wherein a preset ozone limit value is notsurpassed and in an extreme situations ozone is eliminated, the controldevice supplies optimized alternating pulses that are sent to the atleast one ionization apparatus. Each alternating pulse is a completesine curve which is cut at the zero crossing. The frequency is notchanged in this connection. Advantageously, several alternating pulses(several sine curves) are combined to packages or sets. The package sizeand thus the number of alternating pulses per package or set provides apossibility for optimizing the air ionization and for minimizing at thesame time the load on the electrical mains. The discharge voltageremains constant in this connection so that a stable air ionization isensured. In this way, the proportion of outside air can be substantiallylowered.

[0020] According to the embodiment of claim 9, by means of a temporallysupplied periodic alternating voltage a favorable control of theionization apparatus is provided. In this connection, the ionizationapparatus is supplied with alternating pulses or alternating pulsescombined to packages of a periodic alternating voltage that isavailable. The optimized discharge voltage is constant in thisconnection.

[0021] In accordance with the embodiment of claim 10, the proportion ofozone is lowered such that the desired and predetermined limit valuesare ensured. In a first range, the power of the ionization apparatus islowered. When the value of the ozone contents of the intake airincreases despite lowering of air ionization, at least one externalozone source is present. In this case, automatically a mode fordecomposing ozone is switched on by the control device. When the presetlimits are reached again, the device for air treatment is returned tonormal operation. In this connection, the energy level of the ozone ischanged such that it decomposes. The preset values for signalizingcertain ozone values are selected such that sufficient reaction safetyis present.

[0022] This spring return drive as a drive for the safety closureaccording to the embodiment of claim 11 ensures an open safety closurewhen the spring return drive is not triggered. This configurationensures an economic realization with minimal energy costs.

[0023] By means of the escape air channel according to the embodiment ofclaim 12 a portion of the room air reaches the environment. The exhaustair that in this way escapes the room and the device for air treatmentis replaced by outside air through the supply air channel.

[0024] At least one additional ozone sensor in the supply air channeland/or in the recirculating air channel according to the embodiment ofclaim 13 advantageously ensures that ozone generated in at least oneroom is measured immediately. Switching delays do not cause ozone to befed into the room. The ozone that is formed within the room originatesin particular from external sources in the room, for example, printersor copiers. Another advantage results when placing an ozone sensor inthe supply air channel, wherein ozone that is taken in from the exterioris detected. This ozone originates also from external sources, forexample, motor vehicles or other devices that cause air contamination.The special advantage resides in that this ozone is decomposed. This isparticularly important in connection with a closed room. Of course,ozone generated in other ways is also decomposed in the intake air.

[0025] The ozone decomposition is carried out in the pauses between thealternating pulses, the alternating pulse rates and/or the packages ofalternating pulses by means of the compensation of charges of theionized air that is taking place in this connection, wherein the ozoneis converted into natural oxygen clusters/charged oxygen molecules. Thisis taken into consideration in the embodiment of claim 14, wherein thesepauses are generated in a targeted fashion by the control device, and,in this way, the decomposition of the ozone is carried out.

[0026] With the at least one manually actuatable switch, wherein thesafety closure is closed after actuation, in accordance with the claim15, the safety closure, independent of monitoring by the detector forair contamination in the supply air channel, can be closed based on awarning message. In this way, the feeling of being safe can besignificantly increased for persons within the room.

[0027] One embodiment of the invention is illustrated in the drawingsand will be explained in the following in more detail.

[0028] It is shown in:

[0029]FIG. 1 a schematic view of the safety device for the air in atleast one room of a building;

[0030]FIG. 2 a basic illustration of a package of two alternating pulsesfor controlling an ionization apparatus.

[0031] A safety device for the air in at least one room 14 of a buildingis comprised of an intake air channel 3 for taking in outside air, adevice for air treatment, a safety closure in the form of a safety flap6 coupled to a drive, an exhaust air channel 19, and at least onedetector for air contaminants 2 (illustration in FIG. 1). Of course,other mechanisms that ensure an open state as well as a closed state canbe used as safety closures.

[0032] In the end area of the opening of the intake air channel 3 thedetector for air contaminants 2 is provided. It converts at least oneinput signal into an output signal that represents the value of one orseveral parameters. This is, in particular, a sensor for at least onechemical substance, a sensor for a biological organism, a dosemeter, ora device for determining air-borne particles; they are used individuallyor in at least one combination. The sensor for at least one chemicalsubstance changes its electrical or optical properties or puts out anelectrical signal when a chemical substance is present. The sensor forat least one biological organism operates according to the sameprinciple. The biological organism in this connection is, for example, abacterium or a virus. The dosemeter is a luminescence dosemeter. In thisconnection, luminescence refers to the emission of photons in thevisible spectral range in solid bodies during or after action on thecrystal wherein energy is transmitted in some form onto the crystal.This can be realized by radiation of visible light or UV radiation, byparticle exposure or excitation by other ionizing radiation and bychemical, mechanical, or thermal effects on the crystal. In the devicefor determining air-borne particles, particularly the geometry of theparticles is determined. Based on the geometry, it is possible to deducethe type of particle, wherein the shape, the contour, the surface areaof the contour, but also the color, the luminescence and/orphosphorescence can be classified and, based on this classification, thetype and its properties/hazard can be determined.

[0033] The volume of the intake air channel 3 is configured inaccordance with the airflow velocity in the intake air channel 3 and/oras a function of the time delays of the detector for air contaminants 2,the control device 18, and the drive 7 including the inertia of thesafety flap 6.

[0034] Downstream of the intake air channel 3, the safety flap 6 that iscoupled to the drive 7 is present that interrupts the airflow from theexterior in an airtight way when triggered. The room 14 is provided withat least one exhaust air channel 19. The exhaust air channel 19 isconnected to the device for air treatment such that, when the safetyflap 6 is open, a partial recirculating operation or, when the safetyflap 6 is closed, a complete recirculating operation is present. Thedrive 7 for the safety flap 6 is, for example, a spring return drive.The drive 7 can also be formed according to another embodiment as amagnet drive. Moreover, in further embodiments sensors for indicatingthe states of open or closed components of the safety device can bepresent. In the intake air channel 3 a first airflow sensor 4 isarranged.

[0035] The device for air treatment is arranged in the flow direction ofthe outside air downstream of the safety flap 6 and is comprised of anair treatment device 8, a first air quality sensor 5, a second airquality sensor 17, an ionization apparatus 9, a second airflow sensor11, an air humidity sensor 12, and an ozone sensor 13. The air qualitysensors 5, 17, the airflow sensors 4, 11, the air humidity sensor 12,the ozone sensor 13, the drive 7 for the safety flap 6, and the detectorfor air contaminants 2 are all connected to the control device 18.

[0036] The device for air treatment of at least one room 14 operates byair ionization. Downstream of the safety flap 6, the air treatmentdevice 8 is provided to which is connected the supply air channel 10 andthe recirculating air channel 15 originating in the room 14. The intakeairflow is conveyed by a suction intake device 1 for outside air that isin the form of, for example, an intake air blower, and is connected tothe control device 18. The control device 18 controls inter alia the atleast one ionization apparatus 9 that is mounted in the supply airchannel 10 coming from the air treatment device 8 and extending into theroom 14.

[0037] As is known in the art, the ionization apparatus 9 is comprisedof metal plates with or without openings that are arranged in the formof at least one plate capacitor or at least one cylindrical capacitor.The intake air to be ionized and/or the recirculating air flow throughthe plates. During corona discharge between the plates the intake airand/or the recirculating air is ionized.

[0038] For this purpose, the information in the form of electricalsignals derived from

[0039] the first air quality sensor 5 that takes into consideration thequality of the outside air flowing into the air treatment device 8, inparticular, the volatile hydrocarbon load—vaporous organic compounds(VOC)—of the outside air or the actual oxidation potential of theoutside air,

[0040] the second air quality sensor 17 that is mounted in therecirculating air channel 15 coming from the room 14 and extending tothe air treatment device 8 and detects also the volatile oxidizablecomponents of the room air,

[0041] the airflow sensors 4, 11 that measure the flow velocity and thusthe amount of conveyed air,

[0042] the air humidity sensor 12, and

[0043] the ozone sensor 13 are evaluated in the control device 18. Thisis in particular a microcomputer, a computer, or a programmable logiccircuit, for example, FPGA.

[0044] The second airflow sensor 11, the air moisture sensor 12, and theozone sensor 13 are mounted in the supply air channel 10 coming from theair treatment device 8 and extending into the room 14.

[0045] The second air flow sensor 11 determines the flow velocity in thesupply air channel 10 and the air moisture sensor 12 determines therelative air humidity in the supply air channel 10.

[0046] In the supply air channel 10 moreover an ozone sensor 13 ismounted that determines the ozone load in the intake air and supplieselectrical signals that are equivalent to this load to the controldevice 18.

[0047] The electrical power that is supplied to the ionization apparatus9 from the control device 18 is adjusted as a function of the values ofthe first air quality sensor 5, the second airflow sensor 11, the airhumidity sensor 12, the ozone sensor 13, and/or the second air qualitysensor 17. For this purpose, in the control device 18 the signals fromthe first air quality sensor 5, the second airflow sensor 11, the airhumidity sensor 12, the ozone sensor 13, and the second air qualitysensor 17 are linked as data with one another such that the controldevice 18 provides a situation-appropriate power in the form ofalternating pulse rates or several alternating pulse rates combined topackages or sets to the ionization apparatus 9 when a higher amount ofair and/or a greater relative air humidity and/or a greater VOC load ofthe room air occur/s. In these situations, the alternating pulse rate orthe number of alternating pulse rates combined to packages is increased.In a positive extreme situation, for example, for no load of the roomair, a minimal ionization intensity is still supplied to the ionizationapparatus.

[0048] For this purpose, in the control device 18 the following occurs:

[0049] weighting of the individual parameters and linking as a sum ofthe individual vectors,

[0050] a combination as a product of the individual values, or

[0051] any other mathematical treatment, so that the ionizationapparatus 9 is operated with a corresponding optimized or desired power.

[0052] The ionization apparatus 9 is operated with temporal sequences ofa periodic alternating voltage of identical or approximately identicalamplitude. The smallest unit of the sequence is a period of the periodicalternating voltage as an alternating pulse 20 (illustration in FIG. 2).Periods of the periodic alternating voltage that are not required aredismissed. In this way, it is ensured that the voltage during dischargeremains constant and the functional data that are important for theentire process are stable as well as controllable. The periodicalternating voltage has a frequency in this connection that correspondsto the mains frequency that is provided, respectively. A frequencyconverter is not required.

[0053] A stable air ionization and thus an optimal efficiency, i.e., ahigh proportion of positively and negatively charged oxygen ions havinga high bonding tendency, for example, with the VOC proportion containedin the air and with a minimal proportion of radicals in the air, isgenerated only with a defined discharge voltage. It must be maintainedconstant as much as possible so that a minimal tolerance field ismaintained. With the aid of the illustration in FIG. 2, the behavior ofthe corona discharge upon changing of the discharge voltage whensurpassing the limit 21 and dropping below the limit 22 of the tolerancefield between the limits 21, 22 of an optimal discharge voltage will bedescribed in the following. When the limit 21 is surpassed uponincreasing the voltage of the ionization apparatus 9, the ozone load inthe intake air will increase progressively. When the discharge voltagehowever drops below the limit 22, a working field of air ionization willresult that is characterized by a spontaneous corona discharge (buffereffect); this causes the generation of undesirable oxygen radicals orozone. Accordingly, a defined discharge voltage is maintained constantin the process. A situation-appropriate and stable air ionization isobtained by a corresponding activation of the defined alternatingvoltage of the sine curve cut at the zero crossing. In this connection,such a sine curve is the alternating pulse 20, respectively, thatactivates the ionization apparatus 9. For a further optimization of thefunction of the air ionization the control device 18 is designed suchthat additionally the alternating pulse rates can be combined toappropriate packages or sets of certain numbers of alternating pulses.

[0054] The signal of the ozone sensor 13 are evaluated or used in theprocess as follows:

[0055] from 0 to 0.06 ppm ozone proportion in the intake air: no action,

[0056] greater/identical to 0.06 ppm ozone proportion: lowering of themomentary ionization power to 50%,

[0057] for a further increase of the ozone proportion, an external ozonesource is present, and the measure for decomposing ozone is initiated.

[0058] This measure resides in that simultaneously the spacing of thealternating pulses, of the alternating pulse rates and/or the packagesof alternating pulses is changed wherein a compensation of the chargesof the ionized air occurring in the pauses leads to a conversion of theozone into natural oxygen clusters/charged oxygen molecules. The energycompensation correspondence substantially to that of nature. Naturallyexisting oxygen, charged oxygen molecules and ozone in the atmosphere.Ozone is an instable compound that when taking up energy decomposes intocharged bipolar oxygen molecules. This process is advantageously used inthe pauses in a targeted fashion for ozone decomposition.

[0059] The operation of the device for air treatment is moreover carriedout such that a minimum ionization power is maintained even whenextremely low process data are present. This is particularly the casewhen the first air quality sensor 5, the second airflow sensor 11, theair humidity sensor 12, the ozone sensor 13, and the second air qualitysensor 17 signal to the control device 18 that actually no ionization isneeded. In this connection, the adequate natural effect is observed

[0060] During operation of the device for air treatment, via the escapeair channel 16 only a minimal amount of escape air is discharged, and acorresponding amount of outside air is made available that is suppliedvia the intake air channel 3.

[0061] The control device 18 and/or the drive are provided with at leastone manually actuatable switch so that the safety closure is closedafter actuation.

[0062] In another embodiment, the control device 18 can also beconnected to additional sensors or devices that monitor the compositionof the room air. In order to increase the duration of airtight closure,several rooms can be connected by channels so that it is also possibleto perform air compensation between the rooms.

[0063] In a further embodiment, in the intake air channel 3 and/or inthe recirculating air channel 15 at least one additional ozone sensor isarranged. This at least one additional ozone sensor is connected to thecontrol device 18 such that it sends an electrical signal in accordancewith the level of the ozone contents or an electrical signal inaccordance with a predetermined value or several predetermined values ofthe ozone contents.

[0064] In a further embodiment of the safety device for the air in atleast one room of a building, the device for air treatment can beconnected to a control device and the at least one detector for aircontaminants and the drive for the safety closure can be connected to anadditional control device.

[0065] In further embodiments, other devices for air treatment can be acomponent of the safety device according to the invention.

1. A safety device for the air in at least one room of a building,wherein the room has at least one supply air channel for taking inoutside air and at least one device for air treatment, characterized inthat in the intake air channel (3) at least one detector for aircontaminants (2) is arranged that converts at least one input signalinto an output signal representing the value of one or severalparameters, in that a safety closure coupled to a drive is arranged suchthat this safety closure does not close at least partially or closesairtightly the intake air channel (3) or the entrance of the device forair treatment, in that the device for air treatment is arranged in theflow direction of the outside air downstream of the safety closure, inthat the room (14) is provided with at least one exhaust air channel(19), in that the exhaust air channel (19) is connected to the devicefor air treatment such that for the safety closure in the open positiona partial recirculating operation or for the safety closure in theclosed position a complete recirculating operation is present, and inthat the device for air treatment, the detector for air contaminants(2), and the drive are connected to at least one control device (18). 2.The safety device according to claim 1, characterized in that thedetector for air contaminants (2) is a sensor for at least one chemicalsubstance, a sensor for at least one biological organism, a dosemeter,or a device for determining air-borne particles.
 3. The safety deviceaccording to claim 2, characterized in that the dosemeter is aluminescence dosemeter.
 4. The safety device according to claim 1,characterized in that in the intake air channel (3) a first airflowsensor (4) is arranged and in that the first airflow sensor (4) isconnected to the control device (18).
 5. The safety device according toclaims 1 through 4, characterized in that a detector for aircontaminants (2) is present in the end area of the intake opening of theintake air channel (3) and/or in the intake device (1) for outside air.6. The safety device according to claims 1 through 5, characterized inthat the volume of the intake air channel (3) is configured inaccordance with an airflow velocity in the intake air channel (3) and/oras a function of the time delays of the detector for air contaminants(2), the control device (18), and the drive including the inertia of thesafety closure.
 7. The safety device according to claim 1 through 6,characterized in that the device for air treatment is comprised of anair treatment device (8), a first air quality sensor (5), a second airquality sensor (17), an ionization apparatus (9), a second airflowsensor (11), and an air humidity sensor (12), in that in the intake airchannel (3) and/or in the supply air channel (10) to the air treatmentdevice (8) the first air quality sensor (5) is arranged, in that in theroom (14) and/or in the exhaust air channel (19) of the room (14) and/orin a recirculating air channel (15) between the exhaust air channel (19)and the air treatment device (8) the second air quality sensor (17) isarranged, in that the supply air channel (10) is provided between theair treatment device (8) and the room (14) with at least one ionizationapparatus (9), the second airflow sensor (11), and the air humiditysensor (12), and in that the air quality sensors (5, 17), the secondairflow sensor (11), and the air humidity sensor (12) are connected tothe control device (18).
 8. The safety device according to claim 7,characterized in that the supply air channel (10) between the airtreatment device (8) and the room (14) is provided with at least oneionization apparatus (9), the second airflow sensor (11), the airhumidity sensor (12), and the ozone sensor (13) and in that the airquality sensors (5, 17), the second airflow sensor (11), the airhumidity sensor (12), and the ozone sensor (13) are connected to thecontrol device (18).
 9. The safety device according to claim 7,characterized in that a device for a temporally triggered periodicalternating voltage as alternating pulses, alternating pulse rate,and/or package of alternating pulses of a certain number is connected tothe ionization apparatus (9).
 10. The safety device according to claim8, characterized in that an ozone sensor (13) sending an electricalsignal corresponding to the level of the ozone contents or an electricalsignal corresponding to a preset value or several preset values of theozone contents is connected to the control device.
 11. The safety deviceaccording to claim 1, characterized in that the drive is a spring returndrive.
 12. The safety device according to claim 1, characterized in thatthe room (14) having an escape air channel (16) is provided directly orindirectly with a recirculating channel (15), in that the escape airchannel (16) can be closed by a driven flap or valve, and in that thedrive of the flap or the actuating device of the valve is connected tothe control device (18).
 13. The safety device according to claims 1and/or 12, characterized in that in the intake air channel (3) and/or inthe recirculating channel (15) at least one additional ozone sensor isarranged, in that said at least one additional ozone sensor is connectedto the control device (18) such that it provides an electrical signal inaccordance with the level of the ozone contents or provides anelectrical signal based on a predetermined value or severalpredetermined values of the ozone contents.
 14. The safety deviceaccording to claims 7 through 13, characterized in that the device isconnected to the ionization apparatus (9) for a temporally switchedperiodic alternating voltage as alternating pulses, alternating pulserate and/or packages of alternating pulses of a certain number such thatthe number and thus the electrical power supplied to the ionizationapparatus (9) from the control device (18) is adjusted automatically asa function of the values of the first air quality sensor (5), the secondairflow sensor (11), the air humidity sensor (12) and/or the second airquality sensor (17), in that upon the presence of ozone of a certainvalue the momentary ionization power is reduced, and in that, uponfurther increase or a certain value that remains the same of the ozonecontents, the spacing of the alternating pulses, the alternating pulserates and/or the packages of alternating pulses is changed, wherein acompensation of the charges of the ionized air occurring in the pausesleads to a conversion of the ozone into natural oxygen clusters (chargedoxygen molecules).
 15. The safety device according to claim 1,characterized in that the control device (18) and/or the drive areprovided with at least one manually actuatable switch such that thesafety closure is closed after actuation.